WebSocket sending an object to a page method using Javax.websocket.RemoteEndpoint.Basic.sendObject (Object arg0)

The WebSocket interface has a way to send objects directly to the page:

voidjavax. WebSocket. Remoteendpoint. BasicsendObject (Object arg0) throws IOException,encodeexception

If you directly use

Client.session.getBasicRemote (). SendObject (obj);

The following error will occur:

JAVAX.WEBSOCKET.ENCODEEXCEPTION:NO encoder specified for object of class [class Org.ywzn.po.Messagepojo]

One solution is to need an encoder, the following steps:

1, custom of a common Java entity class, this is nothing special, some properties, set, Get, ToString method only

Package Org.ywzn.po;import java.io.serializable;/** * sent to ACTIVEMQ entity class * * @author Summer Snow Date: June 11, 2015 time: PM 12:14:18 */publi C Class Messagepojo implements Serializable {private static final long Serialversionuid = -6451812593150428369l;private St Ring sourse;//Information Source private string messagetype;//message type private string msgcontent;//message content private string target;//send destination Priva Te string infosourceip;//information source ipprivate string createtime;//message save time private String othercontent;//other information public Messagepojo () {super ();} Public Messagepojo (String sourse, String messageType, String msgcontent,string target, String infosourceip, string create Time,string othercontent) {super (); this.sourse = Sourse;this.messagetype = Messagetype;this.msgcontent = msgContent; This.target = Target;this.infosourceip = Infosourceip;this.createtime = Createtime;this.othercontent = otherContent;} Public String Getsourse () {return sourse;} public void Setsourse (String sourse) {this.sourse = Sourse;} Public String Getmessagetype () {return messageType;} public void Setmessagetype (String messageType) {this.messagetype = MessageType;} Public String getmsgcontent () {return msgcontent;} public void Setmsgcontent (String msgcontent) {this.msgcontent = msgcontent;} Public String Gettarget () {return target;} public void Settarget (String target) {this.target = target;} Public String Getinfosourceip () {return INFOSOURCEIP;} public void Setinfosourceip (String infosourceip) {this.infosourceip = Infosourceip;} Public String Getcreatetime () {return createtime;} public void Setcreatetime (String createtime) {this.createtime = Createtime;} Public String getothercontent () {return othercontent;} public void Setothercontent (String othercontent) {this.othercontent = othercontent;} @Overridepublic String toString () {return "Messagepojo [sourse=" + Sourse + ", messagetype=" + messagetype+ ", msgcontent= "+ Msgcontent +", target= "+ target+", infosourceip= "+ Infosourceip +", createtime= "+ Createtime +", othercontent= " + Othercontent + "]";}}

2. Write your own decoder

In this method of encode (), you can customize the value to return, here I need is the Java object into the JSON format string, with a self-written tool class, this can be customized according to their own needs, here only to do a reference.

Package Org.ywzn.websocket;import Javax.websocket.encodeexception;import Javax.websocket.encoder;import Javax.websocket.endpointconfig;import Org.ywzn.po.messagepojo;import Org.ywzn.util.java2json;import com.sdicons.json.mapper.mapperexception;/** * Definition for US encoder *  * @ Writer: Summer Snow date: June 14, 2015 time: 11:58:23 */ public class Serverencoder implements encoder.text<messagepojo> {@Overridepublic void Destroy () {//TODO auto-generated method stub} @Overridepublic void Init (Endpointconfig arg0) {//TODO auto-generated method stub}@ Overridepublic String encode (Messagepojo Messagepojo) throws Encodeexception {try {return Java2json.javatojson ( Messagepojo, false);} catch (Mapperexception e) {//TODO auto-generated catch Blocke.printstacktrace (); return null;}}}

3, WebSocket service terminal

There is only one important place:

@ServerEndpoint (value = "/websocket/news", encoders = {Serverencoder.class})

Encoders added a newly-customized decoding class so that you can use the Client.session.getBasicRemote (). SendObject (obj) directly, and pass in the object.

Package Org.ywzn.websocket;import Java.io.ioexception;import Java.text.simpledateformat;import java.util.Date; Import Java.util.hashmap;import Java.util.map;import Java.util.concurrent.atomic.atomicinteger;import Javax.websocket.encodeexception;import Javax.websocket.endpointconfig;import Javax.websocket.OnClose;import Javax.websocket.onerror;import Javax.websocket.onmessage;import Javax.websocket.onopen;import Javax.websocket.session;import Javax.websocket.server.serverendpoint;import Org.apache.commons.logging.Log; Import Org.apache.commons.logging.logfactory;import Org.ywzn.activemq.sender;import Org.ywzn.po.Messagepojo; Import Org.ywzn.util.java2json;import com.sdicons.json.mapper.mapperexception;/** * Message Assistant Investigation Center WebSocket message Push Service class * * @ Author Summer snow Date: June 10, 2015 time: Morning 9:48:59 */@ServerEndpoint (value = "/websocket/news", encoders = {Serverencoder.class}) pub Lic class Newsannotation {private static final log log = Logfactory.getlog (newsannotation.class);p rivate static final Stri Ng Guest_prefIX = "Guest";p rivate static final Atomicinteger connectionids = new Atomicinteger (0);p rivate static final map<string, O bject> connections = new hashmap<string, object> ();p rivate static final string[] Guestname = {"Gaoyong", "fingerlings", "Li Yan", "Liang", "Cai Jun", "Zhang Xin", "Gao Shuai", "Summer Snow", "Penglianying", "Liu Jian"};p rivate String nickname;private Session session;//Current user idprivate Integer ID ;//Private HttpSession httpsession;public newsannotation () {//nickname = Guest_prefix + connectionids.getandincrement ( );//INT index = Connectionids.getandincrement ();/if (index >= 8) {//Connectionids.set (0);//}//nickname = Guestnam E[index];} @OnOpenpublic Void Start (session session, Endpointconfig Config) {//set<entry<string, object>> entryset =// Config.getuserproperties (). EntrySet ();//For (iterator<entry<string, object>> Iterator = Entryset.iterator ();//Iterator.hasnext ();) {//String key = Iterator.next (). GetKey ();//System.out.println ("[Endpointconfig-->key]:" + key);//SYSTEM.OUT.PRIntln ("value-->" + config.getuserproperties (). Get (key));//pojomethodmapping P =//(pojomethodmapping) Config.getuserproperties (). get (key);//System.out.println ("P.getwspath ()--" + P.getwspath ());//}//String Negotiatedsubprotocol = Session.getnegotiatedsubprotocol ();//System.out.println ("[Getauthority]:" +// Session.getrequesturi (). getauthority ());//System.out.println ("[Getfragment]:" +//Session.getrequesturi (). Getfragment ());//System.out.println ("[GetPath]:" + Session.getrequesturi (). GetPath ());//System.out.println ("[ Getport]: "+ Session.getrequesturi (). Getport ());//System.out.println (" [Getquery]: "+//Session.getrequesturi (). Getquery ());//System.out.println ("[Getrawuserinfo]:" +//Session.getrequesturi (). getrawauthority ());// System.out.println ("[Getrawfragment]:" +//Session.getrequesturi (). Getrawfragment ());//System.out.println ("[ GetHost]: "+ Session.getrequesturi (). GetHost ());//System.out.println (" [Getrawuserinfo]: "+//Session.getrequesturi (). Getrawuserinfo ());// System.out.println ("[Getscheme]:" +//Session.getrequesturi (). Getscheme ());//System.out.println ("[ Getschemespecificpart]: "+//Session.getrequesturi (). Getschemespecificpart ());//System.out.println (" [GetUserInfo ]: "+//Session.getrequesturi (). GetUserInfo ());//System.out.println (" [Negotiatedsubprotocol]: "+// NEGOTIATEDSUBPROTOCOL);//set<entry<string, string>> entryset =//session.getpathparameters (). EntrySet ( );//For (iterator<entry<string, string>> iter =//entryset.iterator (); Iter.hasnext ();) {// System.out.println ("[GetKey]:" + iter.next (). GetKey ());//}//System.out.println ("[Session.getprotocolversion ()]:" +//session.getprotocolversion ()); this.session = Session;id = Integer.parseint (This.session.getId ()); if (ID > 8) {ID = 0;} Nickname = Guestname[id]; SYSTEM.OUT.PRINTLN ("The ID of the current user is:" + ID + "\ nthe user name is:" + nickname); Connections.put (nickname, this); String message = String.Format ("*%s%s", nickname, "Already logged in Message Assistant Investigation Center."); /mass broadcast (message, "all");//Send login messages to actIvemqsender.sendmsg ("Login:" + nickname);} @OnClosepublic void End () {SYSTEM.OUT.PRINTLN ("Message Center connection closed."); Connections.remove (this); String message = String.Format ("*%s%s", nickname, "has disconnected."); /mass//broadcast (message, "all");//Send the login message to activemq//sender.sendmsg ("Quit:" + nickname);} /** * Message Sending Trigger Method * * @param message */@OnMessagepublic void incoming (String message) {System.out.println ("Java received Web page [" + Thi S.nickname + "] messages [message]:" + message ";//Never trust the clientstring filteredmessage = String.Format ("%s:%s ", nickname , Htmlfilter.filter (Message.tostring ()));//Send the login message to Activemqmessagepojo Messagepojo = new Messagepojo (This.nickname, "User dialog", message, "All", this.id.toString (), New SimpleDateFormat ("Yyyy-mm-dd hh:mm:ss"). Format (new Date ()), ""); try { String Javatojson = Java2json.javatojson (Messagepojo, false); SYSTEM.OUT.PRINTLN ("Send message:" + Javatojson); Sender.sendmsg ("message-->" + Javatojson);} catch (Mapperexception e) {//TODO auto-generated catch Blocke.printstacktrace ();} // Sender.sendmsg ("sendmsg:" + message);//Broadcast (Filteredmessage, "All");} @OnErrorpublic void OnError (Throwable t) throws Throwable {log.error ("Chat error:" + t.tostring (), t);} /** * Message Sending method author Summer Snow date: June 10, 2015 time: Morning 9:49:45 * * @param msg * Content sent * @param user * Sent to the specified user, such as */private static void Broadcast (string msg, string user) {//whether mass if (user = = NULL | | "All". Equals (user) | | "". Equals (user) {Sendall (msg);} else {senduser (msg, user);}} /** * Send author to all users Summer Snow date: June 10, 2015 time: Morning 9:50:34 * * @param msg */public static void Sendall (String msg) {for (string Key:connections.keySet ()) {Newsannotation client = null;try {client = (newsannotation) connections.get (key); Synchronized (client) {if (Client.session.isOpen ()) {///If this session is open Client.session.getBasicRemote (). SendText (msg );}}} catch (IOException e) {log.debug ("Chat error:failed to send message to client", e); connections.remove (client); try {Client . Session.close ();} catch (IoexceptioN E1) {//Ignore}string message = String.Format ("*%s%s", Client.nickname, "has been disconnected."); /mass broadcast (message, "All");}}} /** * Send to all users * * @ Writer: Summer Snow date: June 14, 2015 time: Morning 11:14:46 * @param obj * object */public static void Sendall (object obj) {for (String Key:connections.keySet ()) {Newsannotation client = null;try {client = (newsannotation) connections.get (key); synchronized (client) {if (Client.session.isOpen ()) {//If the session is open Client.session.getBasicRemote (). SendObject (obj);}}} catch (IOException e) {log.debug ("Chat error:failed to send message to client", e); connections.remove (client); try {Client . Session.close ();} catch (IOException E1) {//Ignore}string message = String.Format ("*%s%s", Client.nickname, "has been disconnected."); /mass broadcast (message, "All");} catch (Encodeexception e) {//TODO auto-generated catch Blocke.printstacktrace ();}}} /** * Send a message to a specified user author summer snow date: June 10, 2015 time: Morning 9:50:45 * * @param msg * content * @param user * Users */public static void Senduser (String msg, string user) {//Gets the user to send newsannotation c = (newsannotation) connections.get (US  ER); try {if (c! = null) {C.session.getbasicremote (). SendText (msg)}} catch (IOException e) {log.debug ("Chat error:failed To send a message to client ", e); Connections.remove (c); try {c.session.close ();} catch (IOException E1) {//Ignore}string Me Ssage = String.Format ("*%s%s", C.nickname, "has been disconnected."); /mass broadcast (message, "All");}}}

I have built a frame of websocket and activemq here, the following look at the effect:

Resources:

The task of the encoder is to convert application-specific data into a format that can be transferred to the client endpoint. To create an encoder, we're going to know some of the interfaces, just like this, we had to create a decoder.

Decoder.

Encoder	The Encoder interface defines how developers can provide a-to-convert their custom objects into Web socket messages. The Encoder interface contains subinterfaces that allow encoding algorithms to encode custom objects To:text, binary data , character stream and write to an output stream.
Encoder.binary<t>	This interface defines how to provide a-to convert a custom object into a binary message.
Encoder.binarystream<t>	This interface is implemented by encoding algorithms, want to write, the encoded object to a binary stream.
Encoder.text<t>	This interface defines how to provide a-to convert a custom object into a text message.
Encoder.textstream<t>	This interface is implemented by encoding algorithms, want to write, the encoded object to a character stream.

-See more at:http://www.javabeat.net/encoder-websocket-in-javaee-7/#sthash. Fmbfmc2q.dpuf

Reference: http://www.javabeat.net/encoder-websocket-in-javaee-7/

WebSocket sending an object to a page method using Javax.websocket.RemoteEndpoint.Basic.sendObject (Object arg0)